Apply Replica Statements in mysqldump Output

The mysqldump command in MySQL is used to create a backup of MySQL databases. One of its options, --apply-replica-statements, enables the application of replica SQL statements from the binary log when dumping data, ensuring consistency between the dumped data and the replica databases.

Here are several examples demonstrating the usage of --apply-replica-statements in mysqldump:

Example 1: Dump a database while applying replica SQL statements:

        mysqldump --apply-replica-statements my_database > my_database_dump.sql
    

This command exports the database my_database to my_database_dump.sql and applies replica SQL statements from the binary log to ensure data consistency.

Example 2: Dump all databases while applying replica statements:

        mysqldump --apply-replica-statements --all-databases > all_databases_dump.sql
    

This command dumps all databases and applies replica SQL statements to maintain consistency across all dumped databases.

Example 3: Specify MySQL connection parameters and apply replica statements:

        mysqldump --apply-replica-statements --host=localhost --user=myuser --password=mypassword my_database > my_database_dump.sql
    

Here, the command connects to MySQL running on localhost with specified credentials and applies replica SQL statements when dumping my_database.

Example 4: Dump a single table with replica statement application:

        mysqldump --apply-replica-statements my_database my_table > my_table_dump.sql
    

This command dumps only my_table from my_database and ensures that replica SQL statements are applied for data integrity.

Example 5: Dump and compress data while applying replica statements:

        mysqldump --apply-replica-statements --all-databases | gzip > all_databases_dump.sql.gz
    

This command dumps all databases, compresses the output using gzip, and applies replica SQL statements to maintain consistency.

Example 6: Dump a database and include SQL statements for dropping and creating tables:

        mysqldump --apply-replica-statements --databases my_database --add-drop-database > my_database_dump_with_drop.sql
    

Here, the command dumps my_database and includes SQL statements to drop and create the database, applying replica SQL statements for consistency.

Example 7: Dump data and skip dumping of MySQL table structures:

        mysqldump --apply-replica-statements --no-create-info my_database > my_database_data_only.sql
    

This command dumps only the data from my_database without including table structure information, while still applying replica SQL statements.

Example 8: Dump a database with extended insert statements:

        mysqldump --apply-replica-statements --extended-insert my_database > my_database_dump_extended.sql
    

This command dumps my_database with extended insert statements, applying replica SQL statements for maintaining data consistency.

Example 9: Dump a database and include comments with dump information:

        mysqldump --apply-replica-statements --comments my_database > my_database_dump_with_comments.sql
    

This command dumps my_database while including comments with information about the dump process, applying replica SQL statements as well.

Example 10: Dump a database with specific character set encoding:

        mysqldump --apply-replica-statements --default-character-set=utf8 my_database > my_database_dump_utf8.sql
    

This command dumps my_database using UTF-8 character set encoding and applies replica SQL statements for maintaining data integrity.

Verification: To verify that the mysqldump command executed successfully with the --apply-replica-statements option, examine the generated SQL dump files. Look for SQL statements within the dump file that indicate application of replica statements from the binary log. These statements ensure that the dumped data aligns with the data present in replica databases, thus confirming the option’s functionality.

Read Also

Allowing Keywords as Column Names in mysqldump Output
Include Locks around INSERT Statements in mysqldump
Adding DROP TRIGGER Statements in mysqldump Output
Include DROP TABLE Statements in mysqldump Output
Add DROP DATABASE Statements in mysqldump Output